Telephone system



April 26, 1932. E; TEVENS 1,855,616

TELEPHONE SYSTEM Filed Dec. 31, 1930 18 Sheets-Sheet l s q s 3 5 k!) w nK 8 3 2 3 L k k k *v Q k5 u m E m 9 k) k it E /NVENTO/? WESTEl/ENSATTORNEY April 26, 1932. w. E. STEVENS TELEPHONE SYSTEM Filed Dec. 31-,1930 55 ESE E IIIHHIHIHI IHHIIHHIIIIE 18 Sheets-Sheet 2 1 m N w //v l/ENTOR WE STEVENS A TTORNEV April 26,

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TELEPHONE SYSTEM Filed Dec. 31, 1950 18 Sheets-Sheet 3 lNVENTORWESTEVENS 8V A TTORNEV April 26, 1932. w. E. STEVENS TELEPHONE SYSTEM 18Sheets-Sheet 4 Filed Dec. 31, 1930 III'IIII IIIIIJ INVENTOR By WESTEVENS,4 TTORNEY April 26, 1932- w. E. STEVENS 1,855,616

TELEPHONE SYSTEM Filed Dec. 31, 1950' l8 Sheets-Sheet 5 INVENTOR WE.STEVENS A T TORNE V April 26, 1932. w. E. STEVENS 1,855,616

TELEPHONE SYSTEM Filed Dec. 31, 1930 18 Sheets-Sheet 6 II III III Hlllll HilHlllll Ill lllllllll Q i T INVENTOR N N N N N N WESTEVENS aaeyww ATTORNEY April 26, 1932. w. E. STEVENS TELEPHONE SYSTEM 1s Sheets-Sheet 7Filed Dec. 31, 1930 Flu. m.+ 95 u+- REV lNVE/VTOR WEZSTEVE/VS A TTORNE YApril 26, 1932. -w. E. STEVENS 1,855,616

TELEPHONE SYSTEM Filed Dec. 31, 1930 18 Sheets-Sheet 8 lllll llm IN 5 NTOP WESTEVENS B V A rom/Er April 1932. w. E. STEVENS 1,855,616

TELEPHONE SYSTEM FiledDec. 31, 1930 18 Sheets-Sheet 9 INVENTORWESTE'VENS A T TORNEV April 26, 1932. w. E. STEVENS TELEPHONE SYSTEMFiled Dec. 18 Sheets-Sheet 10 A TTORNEV WWW hg M WE w 6 9 April 26,1932. w. E. STEVENS TELEPHONE SYSTEM Filed Dec. 3-1, 1930 18Sheets-Sheet ll [NI/ENTOR WESTEVENS A TTORNEV April 26, 1932. w. E.STEVENS TELEPHONE SYSTEM Filed Dec. 31, 1930 1a Sheets-Sheet 12 INVENTORW 5.5 TE VE NS A TTORNEV April 26, 1932.

W. E. STEVENS TELEPHONE SYSTEM Filed Dec. 31, 1930 18 Sheets-Sheet 13IIHII r //v l/ENTOP M. E. S TEl/ENS A TTORNEV April 26, 1932. w..E.STEVENS TELEPHONE SYSTEM Filed Dec. 31, 1930 18 Sheets-Sheet 14 W. E.STEVENS /N l/E N TOR A TTORNE V April 26, 1932. w. E. STEVENS TELEPHONESY STEM Filed Dec. 31, 1930 18 Sheets-Sheet l5 /NVENTOR By WESTEVENS ATTORNEV A ril 26, 1932. w. E. STEVENS TELEPHONE SYSTEM Filed Dec.

31, 1930 18 SheetsSheet l6 INVENTOR By WESTEVENS @PfiW A TTORA/EK April1932- w. E. STEVENS 1,855,616

TELEPHONE SYSTEM Filed Dec; 31, 1930 18 Sheets-Sheet l7 N VE N TOR m5. 5TEVENS A T TOPNEY April 26, 1932. w. E. STEVENS 1,855,515

TELEPHONE SYSTEM Filed Dec. 31, 1930' 1a Sheets-Sheet 18 //v VENT'OR WESTE VENS A TTORNE) Patented Apr. 26, 1932 UNETED STATES PATENT, OFFICEWILLIAM E. sTEvENs, or PORT wAsEINGToN, NEW Yonnnssrenon To BEL TE E-PHONE LABORATORIES, INCORPORATED, OF NEW YORK, N. Y., A coaPoR'ATIoN OFNEW YORK TELEPHONE SYSTEM Application filed December 31, 1930. SerialNo. 505,835.

This invention relates to telephone systems in which calls areestablished by means of automatically operated apparatus and has for itsobject to increase the speed and efliciency with which operators maycontrol automatic switching equipment.

In large telephone areas, although a majority of the calls may becompleted by means of switching equipment under the control of thesubscribers dial, there are numerous calls in which the assistance of anoperator is necessary.

The present invention contemplates the provision of operator controlledequipment in connection with a tandem otiice whereby the senderregisters may be positioned by means of code pulses transmitted directlyfrom the operators position.

In the particular embodiment chosen for the disclosure of the presentinvention the operator is provided with a key setcompris ing a pluralityof rows of keys, each row corresponding to a digit'of the calledsubscribers number including'both the office code and the numericaldesignation. -When the first key is operated the position is associatedwith an idle sender and as soon as the'sender is found and the oflicekeys operated the transmission of the ofiice code is started. Thedepression of the last key together with the com plete transmission ofthe office code releases the ofiice keys. It also renders the positionselectable in connection with a second call, permitting the operator toreceive instructions regarding the second call during the time that thesender is being positioned for the first call. WVhen transmission of thenumerical digits has started, the oflice keys are released and'theoifice codemay be recorded, but the operation of the key set isinefiective to cause the association of the position with a secondsender until the first sender has been disconnected. The operator isprovided with a reorder key to permit erasing an era roneously recordeddesignation and signalling the originating operator.

The invention has been embodied in an operators position suitable foruse at a tandem office in connection with a sender of the type idisclosed and claimed in Patent 1,840,132,

granted to T. H. Roberts, Jan. 5, 1032, to which reference is made forthe complete showing of the sender and for the details of the operationof variousparts of the present disclosure.

The operators position is provided With-a key set comprising a row ofkeys for each digit of telephonic designation, that is, three rows ofkeys corresponding to three ofice code digits, :1 single key on which torecord the digit 1 which may be used as a 10,000 digit, four rows ofkeys corresponding to the four numerical digits and a row of keys forthe stations digit. The keys of this row alsoact as start keys and anadditional key is provided for use where the designation does notinclude a stationsdigits or is otherwise, abbreviated. The positionequipment also includes a relay arrangement forgenerating cord pulsesaccording to the call indicator code under the control of the key setand for transmitting them in the proper order to an associated sender. r

The operation of the system isbriefiy as follows: This position is usedto receive calls from manual offices which are to be completed through atandem oflice to some other office. T'Vhen the operator at theoriginating office plugs into a jack leading to an outgoing trunk to thetandem oflice, a bridge is connected across the trunk which causes arelay in the tandem districtselectorZto mark the. district to thedistrict finders of the link circuits having access thereto and toground the start conductor. A start circuit is provided P headset. Theoriginating operator then in-- formsthe tandem operator of'the wanted.

number and the tandem operator records the number on her key set. Assoon as the first key has been operated, the link is given a signal towhich it responds by hunting for and seizing an idle sender. When thesender has been found the incoming pulsing conductors of the sender areconnected through to the outgoing pulsing conductors of the position.hen the last ohfice code key has been depressedand-the sender found, thetransmission of the office code digits starts, If a start key has notbeen depressed by the time the oflice code has been completelytransmitted, pulsing ceases and the circuit waits.

When a start key has been operated the-remainder of the number is sentout. After the office code pulses have-been transmitted a-n-d thestartkeope-rated, the keys on which the oflice-code was-recorded are releasedand a -signal is transmitted to the link, which opens the incomingtalking conductors between 'tl1e-'clistrict selector and the positionand restores the selectable condition to the operators position. Asecond link circuit may thereupon select the position, order tonesmaybe-given tothe second originating opera tor,'-thesecondwanted numberpassed, and the ofiice codeof' the second number recorded on the'ke'yset, during the time-that the numerical digits o'f the first wantednumber are being transmitted to the first sender. However, no signal isgiven to the second link circuit to hunt for an idle sender until afterthe transmission of the "first number has been com pleted' and the firstlink has'been disconnec'ted.

Ifth'ebgierator makes amistake in setting up the wantednumber sheoperates reorder key which brings about the release of that part-of 'theconnection which'has been established up tothat time and transmits asignal to the originating operator that the call must beexten'ded again.

The invention will be more clearly understood from ;a detailedconsideration of the operation of the system as a whole. The drawingswhich set forth the invention in clude the following figures:

Figs. 3, 4, 14, and 15 showthe operators headset, key set and otherequipment located at her-position Fig. 2 shows a district selector;

' Figs. 5, 6', 7 and 8 show a link circuit forassoci'ating the districtselector of Fig. 2 with the sender and with the operators position;Figs.9 and 10 show certain control relays of the sender r Figs. 11, 12,13,16, 17 and 18 show the incoming registers, the transfer relays andcertain relays controlled thereby.

"Fig. 1 shows the manner in which Figs. 2 to 1 8 areto be arranged.

The somewhat irregular numbering arrangement of the figures ofthedrawings results from the fact that the same designa tions'havebeen.employed as in the litobe'rts patent above referred to. Figs. 2, 6 to13, and 16 to 18 are copies of the similarly numbered figures, of thatpatent. This has been done to facilitate reference to the Robertspatent.

WVhenthe manual operator at the originating ofli'ce inserts the plug ofher cord in the jack ofthe trunk leading to the district selector ofFig. 2, arela-y is connected across the ti pand ring conductors at theoutgoing end of the trunk, completing a-circuit from batter-y throughthe right winding of relay 201, lower right and upper left contacts ofcam 202, over the tip conductor, through the relay of the trunk circuitand back over the ring conductor to the lower left and upper rightcontacts ofcam 203, left winding of relay 201 and ground. Relay 201operates, closing a circuit from battery through the winding of relay 201, contact of relay'201, right contacts of cam 205 to ground. Relay 201, in operating, disconnects ground from conductor 209 to mark thedistrict selector in the banks ofdistrict finders such as finder 600 ofthe link circuits. It also closes an obvious circuit for relay 207.Relay 207 connects ground from the left back contact of relay 212, rightfront contact of relay 207, lower contacts of cam 211,'to startconductor 210 and thence to the start'circuit of Fig. 8. The startcircuit serves to connect the district selectors oneat a time with linkcircuits as they become available. The selectors and link circuits arenormally divided into two groups andthe start'circuit controls transferbetween the two groups when necessary because of trouble or busyconditions. A similar start circuit is disclosed in U. S. Patent1,567,072, granted December 29, 1925 to W. Matthies.

The link circuit sequence switches stand, when out of use, in positions9 or 18 and are advanced one at a time intopositions 1 or 10 to allotthe links for use. Assuming that the link shown in Figs. 5 and 7 isready for use, the connection of ground to conductor 210 completes -acircuit extending through jack 801, upper back contact ofrelay 802,outer upper'ba'ck contact of'rela'y803, right contacts of cam 701, tothe'winding of relay 601 and battery. Relay 601 closes alocking circuitfor itself over commutator strip 603, brush 605, upper right contact ofcam 704 to ground. Relay 601 alsocloses a circuit from ground at itsinner lower contact over the upper back contact of relay 510 to theupper winding of relay 602 and battery. Relay 602 locks through itslower winding and inner lower contact, lower left contact of cam 702 toground; A branch ofthis locking circuit extends to the upper winding ofrelay 511 and battery. Relay 511 operates, closing a circuit frombattery through the winding of relay 5'12, inner upper front contact ofrelay 511 to ground over the upper right con-

